Test-Driven Development (TDD)

The Red-Green-Refactor cycle in test-driven development involves writing a failing test, creating minimal code to pass that test, and then refactoring the code for maintainability while ensuring tests stay green.

To start writing tests before production code, write a failing test for a new feature, implement the minimal code required to pass that test, refactor the implementation, and repeat the cycle for the next behavior change.

You should apply test-first development when adding new features, fixing bugs, refactoring existing logic, or implementing behavior changes to ensure high code quality and maintainability throughout the software process.

A good test in TDD focuses on effective practices and clear behavior validation, whereas a bad test often stems from poor practices, leading to fragile suites and common rationalizations for skipping the testing process entirely.

Yes, you need a solid understanding of coding practices and test frameworks before using TDD, as the methodology requires you to write, execute, and refactor tests continuously throughout the development cycle.